hammerhead

[ham-er-hed]
noun
1.
the part of a hammer designed for striking.
2.
a shark of the genus Sphyrna, especially S. zygaena, having the head expanded laterally so as to resemble a double-headed hammer, sometimes dangerous to swimmers.
3.
Also called hammerkop [ham-er-kop] . a brown heronlike African bird, Scopus umbretta, having the head so crested as to resemble a claw hammer.
5.
Slang. blockhead; dunce; lout.

Origin:
1525–35; hammer + head

hammerheaded, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
hammerhead (ˈhæməˌhɛd)
 
n
1.  any shark of the genus Sphyrna and family Sphyrnidae, having a flattened hammer-shaped head
2.  a heavily built tropical African wading bird, Scopus umbretta, related to the herons, having a dark plumage and a long backward-pointing crest: family Scopidae, order Ciconiiformes
3.  a large African fruit bat, Hypsignathus monstrosus, with a large square head and hammer-shaped muzzle
 
'hammerheaded
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

hammerhead

(Scopus umbretta), African wading bird, the sole species of the family Scopidae, within the order Ciconiiformes, which also includes herons, flamingos, and storks. The hammerhead ranges over Africa south of the Sahara and occurs on Madagascar and in southwestern Arabia. It is about 60 cm (2 feet) long, nearly uniform umber or earthy brown in colour, and bears a conspicuous horizontal crest on the back of its large head. The heavy, compressed, hook-tipped bill and short legs are black. Active especially at twilight, the bird sits beside a stream with its head down or wades slowly, stirring the mud with one foot and then the other, feeding on mollusks, frogs, small fishes, and aquatic insects. It builds an enormous nest of sticks, sometimes 1.8 m (6 feet) across and 1.2 m (4 feet) high, on a rocky ledge or in a tree. The nest is dome shaped with an entrance on the side and a narrow tunnel leading to a central chamber lined with mud. The bird lays three to six chalky-white eggs

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Scalloped hammerhead sharks, also on the globally endangered species list, also
  live in the waters.
Get up close and personal with sea turtles, fish, rays and hammerhead sharks.
Excepting the rare sighting of a hammerhead or reef shark, it is virtually
  devoid of sea life.
With lethargic grace, the hammerhead shark slices through the blue gloom.
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